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Speaker: Pi-Cheng Wu ( 吳璧丞 ) Advisor: Prof. Yi-Pai Huang ( 黃乙白 ) Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan.

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Presentation on theme: "Speaker: Pi-Cheng Wu ( 吳璧丞 ) Advisor: Prof. Yi-Pai Huang ( 黃乙白 ) Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan."— Presentation transcript:

1 Speaker: Pi-Cheng Wu ( 吳璧丞 ) Advisor: Prof. Yi-Pai Huang ( 黃乙白 ) Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan August.25 2008 55.2: Integrated Active Matrix Capacitive Sensors for Touch Panel LTPS-TFT LCDs E iji Kanda, Tsukasa Eguchi, Yasunori Hiyoshi, Taketo Chino, Yasushi Tsuchiya, Takahiro Iwashita, Tokuro Ozawa, Takao Miyazawa, Tomotaka Matsumoto Display Development Center, Seiko Epson Corporation, Fujimi, Nagano, Japan SID 08 DIGEST

2 2 Advanced Display Optics Lab Outline  Introduction - Touch panel  New touch panel structure & Sensor Architecture  Results  Conclusions

3 3 Advanced Display Optics Lab ResistiveCapacitiveOptical Sensor way Light interrupt Transparency85%>90%>95% ThicknessXXO Operating rangeOOX Threshold forceOXX SensitivityXOX Anti UVXOO Introduction

4 4 Advanced Display Optics Lab Introduction Current issues in touch panel sensor :  Thickness  Optical performance  Sensitivity  Operating ambient luminance  Multi-touch  Price

5 5 Advanced Display Optics Lab Outline  Introduction - Touch panel  New touch panel structure & Sensor Architecture  Results  Conclusions

6 6 Advanced Display Optics Lab New Touch panel structure LC mode : FFS Lateral field structure has high flexibility Design independent LTPS-TFT : Aperture ratio Resolution Thickness

7 7 Advanced Display Optics Lab Sensor Architecture 3 periods of driving sequence a. Initialization b. Charging c. Read-out

8 8 Advanced Display Optics Lab Outline  Introduction - Touch panel  New touch panel structure & Sensor Architecture  Results  Conclusions

9 9 Advanced Display Optics Lab Results

10 10 Advanced Display Optics Lab Results

11 11 Advanced Display Optics Lab Summary Merits Better appearance High resolution Thinner wide viewing angle Multi-touch

12 12 Advanced Display Optics Lab Conclusions What did I learn ? We can combine different characteristics of touch panel to enhance the quality and satisfy our need Active matrix capacitive sensors for touch panel using LTPS-SOG have been proposed

13 13 Advanced Display Optics Lab Conclusions What can I do to improve this technology ? effect will increase when the touch screen size increase S/N will decrease DSP system : Optimize the algorithm to increase the S/N

14 14 Advanced Display Optics Lab Thanks for your kind attention

15 15 Advanced Display Optics Lab Fringe-field Switching (FFS) L D L/D < 1 L/D > 1 FFS mode Opaque electrodeTransparent ITO Widen viewing angle Increase the efficiency of light transmittance

16 16 Advanced Display Optics Lab

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